Polyelectrolyte-modified layered double hydroxide nanocontainers as vehicles for combined inhibitors
authors Carneiro, J; Caetano, AF; Kuznetsova, A; Maia, F; Salak, AN; Tedim, J; Scharnagl, N; Zheludkevich, ML; Ferreira, MGS
nationality International
journal RSC ADVANCES
keywords ACTIVE CORROSION PROTECTION; CERIUM OXIDE NANOPARTICLES; ALUMINUM-ALLOYS; ANTICORROSION COATINGS; EPOXY COATINGS; MG ALLOY; HYDROTALCITE; PERFORMANCE; AA2024-T3; ABILITY
abstract In this work, nanocontainers based on layered double hydroxide (LDH) loaded with two different corrosion inhibitors, namely 2-mercaptobenzothiazole (MBT) and cerium(III) nitrate, were prepared. MBT was intercalated into LDH galleries in anionic form by anion-exchange, while Ce3+ was fixed between polyelectrolyte layers on the surface of LDH-MBT nanoplatelets by the Layer-by-Layer (LbL) method. Both inhibitors were found in the modified LDHs (LDH-Mod) by X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy. The release studies performed by UV-vis spectrophotometry indicated that the main triggering conditions for release of MBT from LDHs changed when LDH nanoplatelets were covered with polyelectrolytes. Furthermore, electrochemical impedance spectroscopy and DC polarization were used to investigate the effect in combining MBT- and Ce3+ within the same nanocontainer, for the corrosion protection of 2024-T3 aluminium alloy directly in solution as well as in a hybrid sol-gel coating. The obtained results open prospects for application of these systems as additives in multifunctional smart coatings.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2015
volume 5
issue 50
beginning page 39916
ending page 39929
digital object identifier (doi) 10.1039/c5ra03741g
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000354211100035

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